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Optimization of Micro-Drilling Parameters for Acoustic Panel Materials Using Taguchi Method Jong Yee Fang1,a, Lu Ean Ooi1,b*, Choe Yung Teoh2,c and Keng Wai Chan1,d 1School of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia 2Faculty of Engineering and Technology, Tunku Abdul Rahman University of Management and Technology, 53300 Kuala Lumpur, Malaysia ajongyee@student.usm.my, b*ooiluean@usm.my, cteohcy@tarc.edu.my, dkengwai.chan@usm.my Keywords: micro perforated, acoustic panel, imperfect hole, noise control.
In a follow up study, Jafar et al. [14] showed that advanced additive manufacturing techniques like PolyJet printing produced uneven edge textures, further reducing agreement with predicted acoustic behavior.
This material represents a high density engineered composite with challenging machinability due to its heterogeneous structure.
Zhuang, The study of sound absorption characteristics of micro-perforated panels with different diameter holes, in: Proceedings of the 29th International Congress and Exhibition on Noise Control Engineering, Nice, France, 2000
Forum 402 (2020) 125–130.

Tab.1 A set of comparatively rational index appraisal system of architecture enterprise Target One Class Index Second Class Index Evaluation Content (Weight) Construction Enterprises Credit Appraisal Target System Enterprise Quality U1 Leadership Quality U11 Working Years Professional Title Educational Background Credit Record Employee Quality U12 Engineering and Technical Personnel Ratio Bachelor Degree or Above Personnel Ratio Labour Productivity Technical Quality U13 Enterprise Qualification The Number of Technical Equipment Management Quality U14 Administrative System Management System Management Method Management Measures Management Performance Financial Capacity U2 Repaying Capabilities U21 Asset-liability Ratio (0.3) Liquidity Ratio (0.25) Quick Ratio (0.25) Capital Assets Net Value Ratio (0.2) Profitability U22 Net Asset Return Ratio (0.2) Rate of Return on Total Assets (0.2) Total Profit Cost Ratio (0.2) Ratio of Income as a Percentage of Sales (0.2) Main Business
Profit Margin (0.2) Operation Capability U23 Average Accounts Receivable Turnover Ratio (0.2) Turnover of Current Assets (0.3) Fixed Asset Turnover (0.2) Turnover of Total Capital (0.3) Growth Capability U24  Main Business’s Increasing Rate of Income (0.3) Profits Growth (0.3) Net Asset Grow Rate (0.4) Administrative Capacity U3 Project Management U31 Construction Site Management Project Management System Cost Control Subcontract Management U32 To review if the appraisee enterprises have entire subcontracting system, stable subcontracting team, and if actual effective management applied to the subcontracting team Quality and Safety Management U33 The Quality and Safety Management System Engineering Quality Qualified Rate Construction Safety Rate Quality Certification Contract Management U34 System of Contracts Contract Performance Rate Management Performance U35 Management Expenses Rate (0.5) Project Excellent Rate (0.5) Credit Record and Achievements U4 Poor Credit Record U41 Engineering
and Construction Field Poor Credit Record Poor Credit Record in Other Field Good Credit Record U42 Engineering and Construction Field Good Credit Record Good Credit Record in Other Field Competitive Power U5 Mechanical Equipment U51 Total Power of Machinery and Equipment Power Equipment Ratio Technical Equipment Ratio Advanced Technology and Equipment Technical Innovation U52 The Number of the Enterprise of Scientific Research Institutions Scientific Research and Technology Patents The Cost of the Investment Intensity Enterprise Qualification U53 Enterprise Qualification, Seniority Level Operating Capacity U6 Business Scale U61 Revenues Enterprise Value Enterprise Profit Growth Rate Business Efficiency U62 Productivity of Labour (0.6) Per Capita Profit Margins (0.4) Market Prospect U7 Business Environment U71 Macro-economy Industry Characteristics Industry Prospect  Notes: Evaluation experts determine weights of evaluation contents and scores of all qualitative indexes; Take (1 － asset-liability
Moody's Corporation and Credit Rating System (First volume, Second Volume) [J].Urban Financial Forum.2000(8,9):46-51
Cost Management of Railway Engineering, 2007.(3)

RSC advances, 3(17), (2013), 5694-5740
In Materials science forum, Trans Tech Publications.
Industrial & Engineering Chemistry Research, 54(44), (2015), 11188-11198
Chemical engineering journal 168, No. 3 (2011): 1272-1278
Chemical Engineering Journal, 252, (2014), 327-336

Enhancing the Oxidation Behavior of Zr-Modified Aluminide Coatings on Inconel 600 at Different Temperatures Nawal Mohammed Dawood1,a, Asia Mishaal Salim2,b 1College of Materials Engineering- Babylon University 2Al-Furat Al-Awsat Technical University, Diwaniyah Technical Institute amat.newal.mohammed@uobabylon.edu.iq, bdw.asia@aut.edu.iq Keywords: Isothermal oxidation, Diffusion coating, Inconel 600 alloy, Nickel Aluminide, Simultaneous Aluminizing-Zirconizing.
Forum 461-464 (2004) 375-382
Vidal-Sétif, 10 Years-Activities at Onera on Advanced Thermal Barrier Coatings, Aerosp.
ALI , MODIFICATION OF OXIDATION BEHAVIOR OF Ni Ti SHAPE-MEMORY ALLOY BY YTTRIUM ADDITION, International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN(P): 2249–6890; ISSN(E): 2249–8001,Vol. 10, Issue 2( Apr 2020) 1187–1204
Kim, Microstructural Evolution of Duplex Grain Structure and Interpretation of the Mechanism for NiO Scales Grown on Pure Ni – and Cr – Doped Substrate During High Temperature Oxidation, Materials Science and Engineering B76, (2000)pp. 173-183

The various variants developed according to Fang et al. [61] include CMT pulse (CMT-P), CMT advanced (CMT-ADV) and CMT pulse advanced (CMT-PADV).
This is an advanced form of the gas tungsten arc welding process.
Soutis, Recent developments in advanced aircraft aluminium alloys.
International Journal of Advanced Manufacturing Technology. 90 (2017) 605–634
International Journal of Advanced Manufacturing Technology. 91 (2017) 1851–1866

Materials Science Forum, 1038 (2021) 303–314
Journal of Achievements in Materials and Manufacturing Engineering, 87 2 (2018) 77–84
Strokov, Criteria based assessment of efficiency of conversion of reciprocating ICE of hybrid vehicle on consumption of biofuels, 2020 IEEE KhPI Week on Advanced Technology, KhPI Week 2020 (05–10 October 2020, Kharkiv, Ukraine), Conference Proceedings, (2020) 177–182
Kostenko, Analysis of the efficiency of using alternative fuels in vehicles, Problems of mechanical engineering, 14 1 (2011) 69–73
Umerenkova, Estimated assessment of the thermophysical properties of biogas used as a fuel for transport, Industrial heat engineering, 32 1 (2010) 35–41.

Unfortunately for the rural dwellers, storage facilities are not always available due to the initial cost of procurement, maintenance and advanced technology which modern storage structures entail.
Forum nutrition. 56 (2003) 35-7pp
Mujumdar, Degradation of ascorbic acid in dried guava during storage, Journal of Food Engineering, 51 2002, pp. 21-26
Journal of agricultural engineering and technology (JAET)(Nigeria).
Published by the Nigerian Institution of Agricultural Engineers

Aziz and Makinde [16] applied a two-dimensional heat conduction model to obtain the thermal performance and entropy generation in an orthotropic convection pin fin used in advanced light weight heat sinks.
Aldossary, On Solution of Natural Convection and Radiation Heat Transfer Problem in a Moving Porous Fin, Arabian Journal for Science and Engineering, 39: 1303-1312, 2014
Applied Thermal Engineering, 20: 1161-1192, 2000
Mehera, A Study on Temperature Distribution, Efficiency and Effectiveness of longitudinal porous fins by using Adomian Decomposition Sumudu Transform Method, Procedia Engineering, 127: 751-758, 2015
Science and Engineering, 43(30): 1485-1497, 2017

Today Proc. 64 (2022) 1433–1439. https://doi.org/j.matpr.2022.04.634 [11] Jiayu You, Zhuying Li, Jialei Zhu, Hang Qin, Yongqing Li, Zhihai Cai, Underwater wet laser welding of duplex stainless steel under various water depths, Materials Science and Engineering. 891 (2024) 145930. https://doi.org/10.1016/j.msea.2023.145930 [12] A.D.
Chinese Journal of Mechanical Engineering. 35 (2022). https://doi.org/10.1186/s10033-021-00674-0 [17] Z.
Parametric Study of Underwater Laser Welding on 304 Austenite Stainless Steel, Materials Science Forum. 972 (2019) 222-228. https://doi.org/10.4028/www.scientific.net/MSF.972.222 [20] W.
Prilipko, Underwater welding in an alternating magnetic field, Metallophysics and advanced technologies, 11 (2009) 1589-1596
Peculiarities Formation of Welded Joints under the External Electromagnetic Influence, Key Engineering Materials. 973 (2024) 73-79. https://doi.org/10.4028/p-72TVPo [25] A.D.

Development of a STEP-NC controller for 5-axis machining of NURBS surfaces Xia Li1, a, Hongbin Liang2,b 1 College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin, Heilongjiang Province, 150001, China 2College of Mechanical Engineering, University of Science and Technology Liaoning, Anshan, Liaoning Province, 114044, China alixia@hrbeu.edu.cn, b lianghb@hit.edu.cn Keywords: STEP-NC; 5-axis; NURBS surfaces Abstract.
With the advance of computer technology and the progress of CNC technology, CNC can access to data of all manufacturing resources at factory floor especially after using new programming interface standard STEP-NC so that many tasks that are performed currently in CAM would be done real-time in CNC in the future.
References [1] Y.Ochiai, T.Sekiya: Advances in Engineering Softwares.
Vol 19,2002,:727–735 [18] STEP Manufacturing Forum. http://www.steptools.com/manforum/meetings.html [19] OMAC API Reference Documentation, http://www.isd.mel.nist.gov/info/omacapi [20] X.